DIY Audio Projects Forum

Welcome to the DIY Audio Projects Message Forum. Use these forums to discuss Hi-Fi audio and to share your DIY Audio Projects. Registration is free and required to post messages and view the file attachments. Registration will only take a minute and registered users do not see any advertisements. After you have completed the online registration process, check your email (including spam/junk folder) for the verification email to activate your account. New members are under moderation - so your posts will not be visible until approved by a moderator. See the Read Me 1st, Forum RULES and Forum FAQ to get started on the forum.

Just added to the site are Uriah's DIY instructions to build the Lightspeed Passive Attenuator. Since optocouplers are used for level control there are no "contact points" in the signal path of this attenuator. If you have an interest in good quality line-level controls, take a look at the DIY Lightspeed Passive Attenuator project page. The project could be easily scaled up to provide level controls for several channels from one control point.

Kelvyn Shaw in the UK sent us a note with a link to his latest DIY Audio Project - a High-End Headphone Amplifier. The headphone amp is made using only premium components and built around the National Semiconductor LME49710 high-performance Hi-Fi operational amplifier ...

Matt (Suncalc) has put together DIY passive volume control using an inexpensive ladder type stepped attenuator. The attenuator comes fully assembled and uses 1% precision metal film resistors on a make before break 2-pole (stereo) 24-position switch. Checking noise levels, Matt found that the that stepped attenuator has a noise figure which is about 26dB lower than a PEC hot molded carbon potentiometer of the same value. This project is very simple to build and should save you a good chunk of change if you are in the market for a simple passive hi-fi volume control.

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